User documentation

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Custom Position

In case your computer is not
connected to another screen, but you would still like to preview the
output, you could imitate a separate screen by creating a custom
position screen. This will create a black box on your control screen as
big as you want it and everything you show live will appear there.

You could, potentially, also use it to adjust the size of the output on a
separate screen as a last resort if no other settings work (on the
monitor/projector or in your operating system), but you would then have
to set it up manually.

Custom position settings

The X and Y position allows you to determine where the custom position
screen will be located. X: 0 and Y: 0 means that it will be in the top
left corner. X will move the screen horizontally and Y vertically. W
adjusts the width and H the height. All numbers are in pixels.

One thing to consider could be to preserve the aspect
ratio of the
screen that you later will use, but this will not be discussed in detail
here. For this example, the wide-screen format 16:9 will be used.

As you can see, the screen will be located 50 pixels from the left side
of the screen and 25 pixels down from the top of the screen, and be 640
pixels wide and 360 pixels in height. This is of course just an example,
so feel free to put in any values if you want to use it.